Received: 21 September 2017
Accepted: 26 June 2018
First Online: 18 July 2018
Ethics approval and consent to participate
: This study was approved by the Human Research Ethics Committee of the National Institute of Traumatology and Orthopedics, Rio de Janeiro, Brazil. All participating or their parents/legal guardians provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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